[Fireskull]

Hello,
the cumulus have a flat-bottom (in France in any case) because this clouds because they progress vertically. At a certain altitude, they spread because the armosphere doesn't contains water at this altitude. At this time, the cumulus it called cumulo-nimbus, the only cloud who can creat tornadoes and light-storm, because there is some wind in it. But this transformation is (in the south of France in summer) very fast, and not realizable in IL-2. And cumulus are big clouds, and there aren't very big clouds in IL-2. Otherwise, here some photos:



cumulus





cumulo-nimbus

I hope I've helped you a little on the cumulus.

Good day, everyone


SolanaBogon, what you are describing here are Cumulonimbus Clouds which produce storms such as thunderstorms and so forth. Yes, they do have a flat bottom by nature.

Cumulus clouds, however, can develop in a much wider variety of atmosheric conditions than the Cumulonimbus. In fact, Cumulus is actually a category of a clouds with more variation than some people are aware. They can develop at different altitudes than other types of clouds and with more variety. Cumulus clouds can also develop in many parts of the world in any season, though summer is most common. A cumulus cloud can be small, gentle, and round like a cotton ball. It can also have a flat bottom, though not always. Some of them are large, too, which shows the variations in this category of clouds.





Fireskull